Covalent Bond
Covalent Bond — A chemical bond formed by sharing electron pairs between atoms, including the peptide bond linking amino acids in a polypeptide chain.
What Is a Covalent Bond?
A covalent bond is a chemical bond formed by sharing electron pairs between atoms. In peptides, the amide bond (-CO-NH-) connecting amino acids is a covalent bond, as are disulfide bonds (S-S), thioester linkages, and all bioconjugation attachments. Covalent modifications are permanent under physiological conditions, unlike non-covalent interactions.
Covalent Bonds in Peptides
- Peptide/amide bond: C-N bond with partial double-bond character (planar, rigid)
- Disulfide: S-S bond between two Cys residues. Reducible
- Ester: Peptide-resin linkage in SPPS. Acid-labile
- Covalent inhibitors: Peptides with electrophilic warheads forming irreversible bonds with target enzymes
Frequently Asked Questions
What is Covalent Bond?
A chemical bond formed by sharing electron pairs between atoms, including the peptide bond linking amino acids in a polypeptide chain.
Why is Covalent Bond important in peptide research?
Covalent Bond is a fundamental concept in chemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.